Miniature & Extra Small Ball Bearings
R4A Miniature & Extra Small Ball Bearing
6.35 × 19.05 × 5.566 mm
R4A is a miniature & extra small ball bearing from the MX-4 series with a 6.35 mm bore, a 19.05 mm outside diameter and a 5.566 mm width. It has a dynamic load rating of 2,016 N and a static load rating of 796 N and a speed rating of 36,000 rpm (oil lubrication), weighing about 7 g. The radial cross-section (D − d) is 12.7 mm.
Brands: NTN, FAG, SKF, NBC, DTC, SLS
R4A Specifications
| Bearing No. | R4A |
|---|---|
| d (Bore) | 6.35 mm |
| D (Outer Dia.) | 19.05 mm |
| B (Width) | 5.566 mm |
| Dynamic Load | 2,016 N |
| Static Load | 796 N |
| Max. RPM | 36,000 |
| Weight | 7 g |
| Series | Open Type Miniature & Extra Small Ball Bearings (1.984mm–9.525mm bore) |
R4A Variants & Designations
Typical designations for this size, subject to availability. Full suffix meanings are listed on the MX-4 series page.
R4A-ZZ
metal shields on both sides
R4A-2RS
rubber seals on both sides
Neighbouring Sizes in the MX-4 Series
R4A — Frequently Asked Questions
What are the dimensions of the R4A bearing?
The R4A has a bore (d) of 6.35 mm, an outside diameter (D) of 19.05 mm and a width of 5.566 mm, so it is written 6.35 × 19.05 × 5.566 mm.
What is the load rating of the R4A?
Dynamic load rating 2,016 N and static load rating 796 N. The speed rating is 36,000 rpm with oil lubrication; for grease lubrication use about 75% of that value.
Is the R4A available with seals, special clearance or other options?
Yes, subject to availability. Typical designations include R4A-ZZ (metal shields on both sides), R4A-2RS (rubber seals on both sides). Tell us the exact designation you need in a quote request.
Which other bearings have the same 6.35 mm bore as the R4A?
Other miniature & extra small ball bearings with a 6.35 mm bore include R168 (9.525 mm OD), R188 (12.7 mm OD), R4 (15.875 mm OD). A larger outside diameter generally means a higher load rating.
Do you supply the R4A bearing across India?
Yes. Logass Trade Centre supplies the R4A Pan India with technical support, from single pieces to bulk orders. Use the quote button to share your quantity and brand preference.
Need pricing on the R4A?
Share your quantity and preferred brand — our technical team will confirm availability and pricing within one business day.